What's wrong with my SUV?
My Ford Explorer is 2003. It has a new battery and starts up great. However once in a while just dies. I have had it checked and alternater is good and no codes came up. Can anyone tell me what it could be. I depend on this vehicle for work and my kids.
Does it JUST die quickly ( electrical) ? OR does it sputter and then die in 20-30 seconds ( gas flow ) ?
Did they check for Vacuum Leaks, Ground Connections, Clean the MAF, Check, clean and grease the Crank and Cam Sensor connections? Dielectric Grease assures a good connection. Also called Bulb or Silicone Grease. When it stalls you either have no Spark or no or contaminated Fuel. Changing your Fuel Filter is never a bad idea.
I would think you have a broken ignition wire, or faulty chip.
When the wire separates the engine dies, Look for a singed wire sheath, where the current is arching (jumping the gap).
If the chip is cracked and heat causes expansion, the break in the circuit causes the system to die.
You need a specialist, Auto Electric Tech, to diagonals it.
Clean the throttle body - same kind of thing happened to my wife's Murano and it fixed it right up.
If it dies at a stoplight or when braking, then I'd lean to a bad or dirty IACV (Idle Air Control Valve) which is used by the PCM/computer to control idle speeds and for starting to allow airflow into the engine at closed throttle. A dirty or defective IACV can often cause stalling and won't trip a CEL light or trouble code.
Given the age of the truck, it's likely due to be cleaned/tested along with cleaning the MAF and throttle body which can get dirty over time and affect starting, idle, and performance. At least, those items should be cleaned as part of normal maintenance and if the stalling trouble persists, then look elsewhere at possibly vacuum leaks or a bad/sticky EGR valve, bad Crank or Cam sensors/ connections, etc. And further testing. Might also be time for a tuneup and change fuel/air filters if never done/due.
Clean the throttle body.
When were the spark plugs changed the last time?
The idle air control motor may be bad if it stalls at stop signs.
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